反应详情

Commercially available 2-ethoxybenzonitrile (25 g, 0.17 Mol) was added dropwise to an ice cooled mixture of chlorosulfonic acid (50.8 mL, 0.765 Mol) and thionyl chloride (12.4 mL, 0.17 Mol) so as to keep the temperature below 10° C. The reaction was then stirred at ambient temperature for 18 h before being poured onto ice/water. This mixture was stirred 1 hr before the precipitated material was filtered off. The resultant solid was dissolved in acetone (300 mL) and triethylamine (25 mL, 0.179 Mol) was added followed by a slow addition of N-ethylpiperazine (25 mL, 0.198 Mol). After being left at ambient temperature for 65 h the mixture was evaporated and the residue stirred with water (1 L) for 2 h. The solids were filtered off, washed with water and dried before being chromatographed over silica gel using ethyl acetate methanol mixtures. Combination and evaporation of like fractions yielded 9.8 g, 17.8% of the title compound. Melting point=86-88° C. M/Z=324 (M+H). 300 MHz Proton NMR (CDCl3); 1.06 (t, 3H), 1.55 (t, 3H), 2.43 (q, 2H), 2.54 (m, 4H), 3.06 (m, 4H), 4.25 (q, 2H), 7.08 (d 1H), 7.90 (dd, 1H), 7.97 (d,1H).

1. temperaturecooled
2. customthe temperature below 10° C
3. additionbefore being poured onto ice/water
4. stirringThis mixture was stirred 1 hr before the precipitated material
5. filtrationwas filtered off
6. dissolutionThe resultant solid was dissolved in acetone (300 mL)
7. waitAfter being left at ambient temperature for 65 h the mixture
8. customwas evaporated
9. stirringthe residue stirred with water (1 L) for 2 h
10. filtrationThe solids were filtered off
11. washwashed with water
12. customdried
13. custombefore being chromatographed over silica gel
14. customCombination and evaporation of like fractions